Vitamins are necessary nutrients for human body to maintain normal physiological functions. It can not be synthesized in the body or with insufficient synthesis. It must be taken in from a variety of food. The vitamin is not a source of energy. Their role is to guarantee the normal functioning of physiological functions. There are many different types of vitamins. It can be divided into fat-soluble vitamins and water-soluble vitamins. Fat-soluble vitamins are dissolving in water. It becomes water-soluble metabolites excreted through the urine or faeces. Water-soluble vitamins are dissolving in water. Normal excess intake can not accumulate in the body but through the increase in urine output. However, intaking large doses can cause some adverse reactions, such as vomiting and kidney.

Vitamin A, also known as retinol, is a fat soluble vitamin. It maintains the integrity of epithelial tissue, the immune system structure and function, normal vision, especially dark adaptability and normal cell differentiation and proliferation. Astaxanthin maintains the normal function of the gonads body and the normal development of the embryo, anti-oxidation function. Their sources are liver, carrots, milk and dairy products, dried fruit and fish oil.

Vitamin B2, also known as riboflavin, is a water soluble vitamin. As coenzyme of oxidoreductases involved in body metabolism and energy generation in the oxidation reduction reaction, such as participation in glucose, certain amino acids and fat oxidation process to provide heat for the body. Their food sources, mainly the liver, kidneys, cereals, meat, milk, green vegetables. Vitamin B6-derived pyridoxal phosphate topiramate involved in amino acid metabolism, water-soluble vitamin. As proteins, lipids, carbohydrates secondary metabolic factors involved in normal cell differentiation and DNA synthesis, hemoglobin synthesis, neurotransmitter synthesis, synthesis of hormones.

Vitamin C, also known as ascorbic acid, is a water-soluble vitamin. As antioxidants, promote the absorption of iron and folic acid metabolism involved in the synthesis of collagen, promote wound healing and can promote the synthesis of adrenal corticosteroids, immunoglobulin, neurotransmitters, etc. Food source for citrus, fresh fruits and vegetables. Vitamin D is fat soluble vitamins, including a group of steroid derivatives D2 and D3. Minoxidil can be adjusted small intestine absorption of calcium and phosphorus to promote the calcium-binding protein synthesis in small intestinal cells, thereby contributing to the absorption of calcium; to promote the Osteocalcin free into the blood, transported to the calcification of new bone to make synergy with parathyroid hormone. Plenty of sunshine is the main source of vitamin D. Other sources are cod liver oil, eggs, milk and dairy products.

Vitamin E, also known as tocopherol, fat-soluble vitamins. It can easily be oxidized. It is an effective antioxidant. Protection of carotene, vitamin A, linoleic acid in the small intestine is oxidized; protect cell membranes, especially the red cell membrane from free radicals and oxidant injury, in order to maintain its stability; anti-hardening of the arteries. Food sources of vegetable oil, margarine, green vegetables. Vitamin K is fat-soluble vitamins, including K1, K2, a group similar to the role of the naphthoquinone and phylloquinone. Synthetic vitamin K3 water-soluble increase, easy to absorb. Its role is not yet entirely clear, the promotion of prothrombin synthesis, clotting factors, vitamin K-dependent factor.

Biotin, also known as vitamin H. It belongs to water-soluble vitamins. It constitutes the coenzyme of tcarboxylase and maintains hair, skin and nails’ healthy. It also participate in the direct source of fatty acids, the genetic material (DNA) and adenosine triphosphate (ATP is the body energy’s main source, they are constantly synthesis) anabolism and catabolism of amino acids. Mild lack can cause dry skin, scaling and hair brittle. Severe lack can cause reversible hair loss, depression, muscle pain and atrophy. Human intestinal bacteria can be synthesized a part of them. Other major sources are animal liver, kidney, eggs and peanuts. Pantothenic acid is a water-soluble B vitamin. It is involved in protein, lipid and carbohydrate metabolism. It also involves in cholesterol and steroid hormone synthesis. It is from the liver, kidney, milk, dairy products and cereals.Source: